package com.example.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.example.common.dtos.ResponseResult;
import com.example.common.enums.AppHttpCodeEnum;
import com.example.search.eneity.dto.UserSearchDto;
import com.example.search.service.ArticleSearchService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ArticleSearchServiceImpl implements ArticleSearchService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    /**
     * es文章分页检索
     *
     * @param dto
     * @return
     */
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {

        //1.检查参数
        if (dto == null || StringUtils.isBlank(dto.getSearchWords())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //布尔查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

        //关键字的分词之后查询
        QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords()).field("name").field("brief").field("type").defaultOperator(Operator.OR);
        boolQueryBuilder.must(queryStringQueryBuilder);
        //查询小于mindate的数据
        RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("createTime").lt(dto.getMinBehotTime().getTime());
        boolQueryBuilder.filter(rangeQueryBuilder);

        //分页查询
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(dto.getPageSize());

        //按照发布时间倒序查询
        searchSourceBuilder.sort("createTime", SortOrder.DESC);

        //设置高亮  title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("name");
        highlightBuilder.field("brief");
        highlightBuilder.field("type");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        /*highlightBuilder.preTags("red");
        highlightBuilder.postTags("red");*/
        searchSourceBuilder.highlighter(highlightBuilder);


        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


        //3.结果封装返回

        List<Map> list = new ArrayList<>();

        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            //处理高亮
            Text[] nameHighlights = null;
            Text[] briefHighlights = null;
            Text[] typeHighlights = null;
            if (hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0) {
                if (hit.getHighlightFields().get("name") != null && hit.getHighlightFields().get("name").getFragments() != null) {
                    nameHighlights = hit.getHighlightFields().get("name").getFragments();
                } else if (hit.getHighlightFields().get("brief") != null && hit.getHighlightFields().get("brief").getFragments() != null) {
                    briefHighlights = hit.getHighlightFields().get("brief").getFragments();
                } else if (hit.getHighlightFields().get("type") != null && hit.getHighlightFields().get("type").getFragments() != null) {
                    typeHighlights = hit.getHighlightFields().get("type").getFragments();
                }
                String name = StringUtils.join(nameHighlights);
                String brief = StringUtils.join(briefHighlights);
                String type = StringUtils.join(typeHighlights);
                //高亮标题
                if (name != null) {
                    map.put("h_title", name);
                } else if (brief != null) {
                    map.put("h_brief", brief);
                } else if (type != null) {
                    map.put("h_type", type);
                }
            } else {
                //原始标题
                map.put("h_title", map.get("name"));
            }
            list.add(map);
        }

        return ResponseResult.okResult(list);

    }

    @Override
    public ResponseResult searchAll() throws IOException{
        //1.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //布尔查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

        //搜索全部图书
        MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
        boolQueryBuilder.must(matchAllQueryBuilder);

        //设置查询条件
        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        List<Map> list = new ArrayList<>();

        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            list.add(map);
        }
        return ResponseResult.okResult(list);
    }
}